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发明名称
Apparatus for cleaning the filter bed of a well
摘要
申请公布号
US1918756(A)
申请公布日期
1933.07.18
申请号
US19320613433
申请日期
1932.05.25
申请人
JUDY PHILIP S
发明人
JUDY PHILIP S.
分类号
E03B3/15;E21B37/08
主分类号
E03B3/15
代理机构
代理人
主权项
地址
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